简化javax验证符号消息的简单方法

Question

我已经阅读了一些关于如何自定义处理API请求验证错误的答案和问题。然而，这一切似乎有点过头了。我的endpoint中有一个简单的对象：

@NotNull(message = "A target group must be provided")
@NotBlank(message = "Target group cannot be blank")
private String targetGroup;

@NotNull(message = "A target entity must be provided")
@NotBlank(message = "Target entity cannot be blank")
private String targetEntity;

@NotNull(message = "A target entity identifier must be provided")
@NotBlank(message = "Target entity identifier cannot be blank")
private String targetEntityIdentifier;

@NotNull(message = "A content must be provided")
@NotBlank(message = "Content cannot be blank")
private String content;

发送空值或空值时引发的错误是：

{
    "timestamp": "2022-02-03T15:01:43.296+00:00",
    "status": 400,
    "error": "Bad Request",
    "message": "JSON parse error: Cannot construct instance of `com.foo.notification.adapter.in.web.request.NotificationItemRequest`, problem: targetGroup: Target group cannot be blank, targetGroup: A target group must be provided; nested exception is com.fasterxml.jackson.databind.exc.ValueInstantiationException: Cannot construct instance of `com.foo.notification.adapter.in.web.request.NotificationItemRequest`, problem: targetGroup: Target group cannot be blank, targetGroup: A target group must be provided\n at [Source: (PushbackInputStream); line: 5, column: 1]",
    "path": "/notification"
}

这条信息传递给前端有点太多了。他们需要的只是“目标群体不能是空白的”。我想将上面的信息转换为以下内容：

{
    "timestamp": "2022-02-03T15:01:43.296+00:00",
    "status": 400,
    "error": "Bad Request",
    "message": "A target group must be provided",
    "path": "/notification"
}

我怎样才能做到这一点？

Answer 1

使用自定义处理程序，当验证引发约束冲突异常时（javax.validation.ConstraintViolationException），使用自定义异常处理程序处理它，因此；您可以根据使用情况简化响应。

例如：

@ControllerAdvice
public class SampleApiExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler
    public ResponseEntity<???> handle(ConstraintViolationException ex) {
        LOGGER.error("Domain violation error", ex);
        return badRequest().body("YOUR_RESPONSE_BODY");
    }
}